#define _CRT_SECURE_NO_WARNINGS 1
#include "Date.h"

int GetMonthDay(int year, int month)
{
	static int arr[13] = { 0,31,28,31,30,31,30,31,31,30,31,30,31 };

	if (month == 2 && (year % 4 == 0 && year % 100 != 0 || year % 40 == 0)) {
		return 29;
	}

	return arr[month];
}

Date& Date::operator+=(int day)
{
	_day += day;

	while (_day > GetMonthDay(_year, _month)) {
		_day -= GetMonthDay(_year, _month);
		_month++;

		if (_month == 13)
		{
			_year++;
			_month = 1;
		}
	}
	return *this;
}
Date Date::operator+(int day)
{
	Date tmp = *this;
	tmp += day;

	return tmp;
}

Date& Date::operator-=(int day)
{
	_day -= day;

	while (_day < 0)
	{
		--_month;
		if (_month == 0) {
			_month = 12;
		}
		_day += GetMonthDay(_year, _month);
	}
	return *this;
}
Date& Date::operator-(int day)
{
	Date tmp = *this;
	tmp -= day;
	return *this;
}

bool Date::operator==(const Date& d)
{
	return _year == d._year && _month == d._month && _day == d._day;
}
bool Date::operator<(const Date& d)
{
	if (_year < d._year) {
		return true;
	}
	else if (_year == d._year) {
		if (_month < d._month) {
			return true;
		}
		else if (_month == d._month) {
			return _day < d._day;
		}
	}
	return false;
}
bool Date::operator<=(const Date& d)
{
	return *this < d || *this == d;
}
bool Date::operator>(const Date& d)
{
	return !(*this < d);
	
}
bool Date::operator>=(const Date& d)
{
	return *this > d || *this == d;
}